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This commit rejects an UE that connects by sending RRCConnectionRequest with S-TMSI.

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The observed behavior (samsung phone, lte dongle, sequans box) is that the UE
keeps connecting over and over again.
This commit is contained in:
Cedric Roux
2015-10-09 17:15:11 +02:00
parent 477104ec18
commit c383e50bd6
3 changed files with 123 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
openair2/RRC/LITE/MESSAGES/asn1_msg.c
+61
View File
@@ -2110,6 +2110,67 @@ do_RRCConnectionReestablishmentReject(
return((enc_rval.encoded+7)/8);
}
//------------------------------------------------------------------------------
uint8_t
do_RRCConnectionReject(
uint8_t Mod_id,
uint8_t* const buffer)
//------------------------------------------------------------------------------
{
asn_enc_rval_t enc_rval;
DL_CCCH_Message_t dl_ccch_msg;
RRCConnectionReject_t *rrcConnectionReject;
memset((void *)&dl_ccch_msg,0,sizeof(DL_CCCH_Message_t));
dl_ccch_msg.message.present = DL_CCCH_MessageType_PR_c1;
dl_ccch_msg.message.choice.c1.present = DL_CCCH_MessageType__c1_PR_rrcConnectionReject;
rrcConnectionReject = &dl_ccch_msg.message.choice.c1.choice.rrcConnectionReject;
// RRCConnectionReject
rrcConnectionReject->criticalExtensions.present = RRCConnectionReject__criticalExtensions_PR_c1;
rrcConnectionReject->criticalExtensions.choice.c1.present = RRCConnectionReject__criticalExtensions__c1_PR_rrcConnectionReject_r8;
/* let's put a wait time of 1s for the moment */
rrcConnectionReject->criticalExtensions.choice.c1.choice.rrcConnectionReject_r8.waitTime = 1;
#ifdef XER_PRINT
xer_fprint(stdout, &asn_DEF_DL_CCCH_Message, (void*)&dl_ccch_msg);
#endif
enc_rval = uper_encode_to_buffer(&asn_DEF_DL_CCCH_Message,
(void*)&dl_ccch_msg,
buffer,
100);
AssertFatal (enc_rval.encoded > 0, "ASN1 message encoding failed (%s, %ld)!\n",
enc_rval.failed_type->name, enc_rval.encoded);
#if defined(ENABLE_ITTI)
# if !defined(DISABLE_XER_SPRINT)
{
char message_string[20000];
size_t message_string_size;
if ((message_string_size = xer_sprint(message_string, sizeof(message_string), &asn_DEF_DL_CCCH_Message, (void *) &dl_ccch_msg)) > 0) {
MessageDef *msg_p;
msg_p = itti_alloc_new_message_sized (TASK_RRC_ENB, RRC_DL_CCCH, message_string_size + sizeof (IttiMsgText));
msg_p->ittiMsg.rrc_dl_ccch.size = message_string_size;
memcpy(&msg_p->ittiMsg.rrc_dl_ccch.text, message_string, message_string_size);
itti_send_msg_to_task(TASK_UNKNOWN, Mod_id, msg_p);
}
}
# endif
#endif
#ifdef USER_MODE
LOG_D(RRC,"RRCConnectionReject Encoded %d bits (%d bytes)\n",
enc_rval.encoded,(enc_rval.encoded+7)/8);
#endif
return((enc_rval.encoded+7)/8);
}
uint8_t do_RRCConnectionRelease(
uint8_t Mod_id,
uint8_t *buffer,
openair2/RRC/LITE/MESSAGES/asn1_msg.h
+10
View File
@@ -218,6 +218,16 @@ do_RRCConnectionReestablishmentReject(
uint8_t Mod_id,
uint8_t* const buffer);
/**
\brief Generate an RRCConnectionReject DL-CCCH-Message (eNB).
@param Mod_id Module ID of eNB
@param buffer Pointer to PER-encoded ASN.1 description of DL-CCCH-Message PDU
@returns Size of encoded bit stream in bytes*/
uint8_t
do_RRCConnectionReject(
uint8_t Mod_id,
uint8_t* const buffer);
/**
\brief Generate an RRCConnectionRequest UL-CCCH-Message (UE) based on random string or S-TMSI. This
routine only generates an mo-data establishment cause.
openair2/RRC/LITE/rrc_eNB.c
+52 -2
View File
@@ -963,6 +963,49 @@ rrc_eNB_generate_UECapabilityEnquiry(
}
//-----------------------------------------------------------------------------
void
rrc_eNB_generate_RRCConnectionReject(
const protocol_ctxt_t* const ctxt_pP,
rrc_eNB_ue_context_t* const ue_context_pP,
const int CC_id
)
//-----------------------------------------------------------------------------
{
#ifdef RRC_MSG_PRINT
int cnt;
#endif
eNB_rrc_inst[ctxt_pP->module_id].carrier[CC_id].Srb0.Tx_buffer.payload_size =
do_RRCConnectionReject(ctxt_pP->module_id,
(uint8_t*) eNB_rrc_inst[ctxt_pP->module_id].carrier[CC_id].Srb0.Tx_buffer.Payload);
#ifdef RRC_MSG_PRINT
LOG_F(RRC,"[MSG] RRCConnectionReject\n");
for (cnt = 0; cnt < eNB_rrc_inst[ctxt_pP->module_id].carrier[CC_id].Srb0.Tx_buffer.payload_size; cnt++) {
LOG_F(RRC,"%02x ", ((uint8_t*)eNB_rrc_inst[ctxt_pP->module_id].Srb0.Tx_buffer.Payload)[cnt]);
}
LOG_F(RRC,"\n");
#endif
MSC_LOG_TX_MESSAGE(
MSC_RRC_ENB,
MSC_RRC_UE,
eNB_rrc_inst[ctxt_pP->module_id].carrier[CC_id].Srb0.Tx_buffer.Header,
eNB_rrc_inst[ctxt_pP->module_id].carrier[CC_id].Srb0.Tx_buffer.payload_size,
MSC_AS_TIME_FMT" RRCConnectionReject UE %x size %u",
MSC_AS_TIME_ARGS(ctxt_pP),
ue_context_pP == NULL ? -1 : ue_context_pP->ue_context.rnti,
eNB_rrc_inst[ctxt_pP->module_id].carrier[CC_id].Srb0.Tx_buffer.payload_size);
LOG_I(RRC,
PROTOCOL_RRC_CTXT_UE_FMT" [RAPROC] Logical Channel DL-CCCH, Generating RRCConnectionReject (bytes %d)\n",
PROTOCOL_RRC_CTXT_UE_ARGS(ctxt_pP),
eNB_rrc_inst[ctxt_pP->module_id].carrier[CC_id].Srb0.Tx_buffer.payload_size);
}
//-----------------------------------------------------------------------------
void
rrc_eNB_generate_RRCConnectionReestablishmentReject(
@@ -3627,8 +3670,15 @@ rrc_eNB_decode_ccch(
} else {
rrcConnectionRequest = &ul_ccch_msg->message.choice.c1.choice.rrcConnectionRequest.criticalExtensions.choice.rrcConnectionRequest_r8;
{
AssertFatal(rrcConnectionRequest->ue_Identity.present == InitialUE_Identity_PR_randomValue,
"unsupported InitialUE-Identity in RRCConnectionRequest");
if (rrcConnectionRequest->ue_Identity.present != InitialUE_Identity_PR_randomValue) {
LOG_E(RRC,
PROTOCOL_RRC_CTXT_UE_FMT" RRCConnectionRequest with S-TMSI not supported yet, let's reject the UE\n",
PROTOCOL_RRC_CTXT_UE_ARGS(ctxt_pP));
rrc_eNB_generate_RRCConnectionReject(ctxt_pP,
rrc_eNB_get_ue_context(&eNB_rrc_inst[ctxt_pP->module_id], ctxt_pP->rnti),
CC_id);
break;
}
AssertFatal(rrcConnectionRequest->ue_Identity.choice.randomValue.size == 5,
"wrong InitialUE-Identity randomValue size, expected 5, provided %d",
rrcConnectionRequest->ue_Identity.choice.randomValue.size);